光催化
材料科学
半导体
钝化
辐照
化学工程
胶体
吸收(声学)
可见光谱
溶剂
激光器
光化学
纳米技术
催化作用
光电子学
光学
化学
有机化学
复合材料
物理
工程类
核物理学
图层(电子)
作者
Simona Filice,Roberto Fiorenza,R. Reitano,S. Scalese,Salvatore Sciré,Giuseppe Fisicaro,Ioannis Deretzis,Antonino La Magna,Corrado Bongiorno,Giuseppe Compagnini
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2020-08-25
卷期号:3 (9): 9127-9140
被引量:13
标识
DOI:10.1021/acsanm.0c01783
摘要
Laser irradiation in liquid is a green, low cost, and tunable technique that can be used in order to improve solar photocatalytic activity of inorganic semiconductors. The interaction between the semiconductor and the dispersing medium is a key parameter to be investigated before and after the laser modification, since it can affect the final morphological and chemical–physical properties of the material. In this work, titania colloids were properly modified by UV laser irradiation process in different solvents. The interaction of solvents (water or ethanol) with titania surface was investigated by spectroscopic characterizations and ab initio calculations based on structure predictions at a density functional theory level. Both solvents interact with oxygen vacancies on titania surface, resulting in a partial or complete passivation of defects by water and ethanol molecules, respectively. The modified samples showed an increase of the photocatalytic hydrogen production under both UV and solar light irradiation. The use of ethanol as solvent during the laser process was found to be the best choice to improve the activity of TiO2 sample under visible light. The as-developed strategies may open up an interesting avenue for designing semiconductor materials with visible light absorption properties and enhanced photocatalytic performance.
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